This is a simple first cordapp application for a Smart Derivative Contract.
It is based on the following paper paper
The corda implementation makes use of Corda's SchedulableState
Logic to implement an scheduled based process logic between the participating parties.
In the demo the scheduling is based on a relative scheduled where the next event takes place serveral seconds after the preceeding one.
The code was derived from the Java Cordapp Template
which can be cloned here.
See https://docs.corda.net/getting-set-up.html.
- Start gradle build script:
gradlew deployNodes
. This takes a while. Get your coffee - Go to folder
build/nodes/
and startrunnodes
. Three console windows will appear, one for each node. Wait until each node is started. - Go to console of BankA and type:
start SDCFlow otherParty: BankB
- Trade Inception Flow will start and wait until it is finalised
- Type:
flow watch
and you should see the process events appearing. Up to some random event the process will continue. - Go to other console of Bank B and type
flow watch
you will see the acceptance flows - Since jdbc is configured you might want to look inside DB. To get things started look here
- This is rather a demo application which only sends messages. Fully implement SDC Process Logic and according state transition checks
- Full Flow Design for manual triggered inception phase
- Include valuation process either from or by direkt usage of finmath library
- Notray node has nothing to do, set this node up
- Configure 4th node for account manager to handle account transaction management even with regard to additional buffer account
- To persist state objects in the database let
SDCProcessState
implementQueryableState
- generateMappedObject, first link here
We recommend editing your IntelliJ preferences so that you use the Gradle runner - this means that the quasar utils
plugin will make sure that some flags (like -javaagent
- see below) are
set for you.
To switch to using the Gradle runner:
- Navigate to
Build, Execution, Deployment -> Build Tools -> Gradle -> Runner
(or search forrunner
)- Windows: this is in "Settings"
- MacOS: this is in "Preferences"
- Set "Delegate IDE build/run actions to gradle" to true
- Set "Run test using:" to "Gradle Test Runner"
If you would prefer to use the built in IntelliJ JUnit test runner, you can run gradlew installQuasar
which will
copy your quasar JAR file to the lib directory. You will then need to specify -javaagent:lib/quasar.jar
and set the run directory to the project root directory for each test.
See https://docs.corda.net/tutorial-cordapp.html#running-the-example-cordapp.
When started via the command line, each node will display an interactive shell:
Welcome to the Corda interactive shell.
Useful commands include 'help' to see what is available, and 'bye' to shut down the node.
Tue Nov 06 11:58:13 GMT 2018>>>
You can use this shell to interact with your node. For example, enter run networkMapSnapshot
to see a list of
the other nodes on the network:
Tue Nov 06 11:58:13 GMT 2018>>> run networkMapSnapshot
[
{
"addresses" : [ "localhost:10002" ],
"legalIdentitiesAndCerts" : [ "O=Notary, L=London, C=GB" ],
"platformVersion" : 3,
"serial" : 1541505484825
},
{
"addresses" : [ "localhost:10005" ],
"legalIdentitiesAndCerts" : [ "O=PartyA, L=London, C=GB" ],
"platformVersion" : 3,
"serial" : 1541505382560
},
{
"addresses" : [ "localhost:10008" ],
"legalIdentitiesAndCerts" : [ "O=PartyB, L=New York, C=US" ],
"platformVersion" : 3,
"serial" : 1541505384742
}
]
Tue Nov 06 12:30:11 GMT 2018>>>
You can find out more about the node shell here.
clients/src/main/java/com/template/Client.java
defines a simple command-line client that connects to a node via RPC
and prints a list of the other nodes on the network.
Run the runTemplateClient
Gradle task. By default, it connects to the node with RPC address localhost:10006
with
the username user1
and the password test
.
Run the Run Template Client
run configuration. By default, it connects to the node with RPC address localhost:10006
with the username user1
and the password test
.
clients/src/main/java/com/template/webserver/
defines a simple Spring webserver that connects to a node via RPC and
allows you to interact with the node over HTTP.
The API endpoints are defined here:
clients/src/main/java/com/template/webserver/Controller.java
And a static webpage is defined here:
clients/src/main/resources/static/
Run the runTemplateServer
Gradle task. By default, it connects to the node with RPC address localhost:10006
with
the username user1
and the password test
, and serves the webserver on port localhost:10050
.
Run the Run Template Server
run configuration. By default, it connects to the node with RPC address localhost:10006
with the username user1
and the password test
, and serves the webserver on port localhost:10050
.
The static webpage is served on:
http://localhost:10050
While the sole template endpoint is served on:
http://localhost:10050/templateendpoint
You should extend this template as follows:
- Add your own state and contract definitions under
contracts/src/main/java/
- Add your own flow definitions under
workflows/src/main/java/
- Extend or replace the client and webserver under
clients/src/main/java/
For a guided example of how to extend this template, see the Hello, World! tutorial here.